Single phase ground fault definition

Three-phase electric power system,only in the insulation between the phase conductors and ground (to appear.Broadly,single-phase earth fault,including single phase grounding short circuit,single phase grounding short circuit is a special phenomenon of single phase ground fault,only the transformer neutral point grounding system will be.Narrowly speaking,single-phase earth fault and single-phase grounding short circuit are two concepts.One is a failure,is an accident.Power system www.dongfeng-motor.com fault and accident is divided in narrow sense.Refers to the one-phase ground fault line (electric) any phase without load and earth wire connected directly,in the 380/220 power supply system or other grounding system.

due to the transformer neutral is grounded,and grounding resistance is very small,wire (electric) any phase without load ground connected directly,and instant will produce very big current,burn out the wire,power distribution equipment or tripping,etc.,so is a serious accident,one-phase ground fault power system is to avoid as far as possible.In power system,there are many places not grounded system power supply,such as dust,inflammable and explosive special field,such as our country all 6-10 kv,35 kv power supply system,etc.,is the neutral point grounding are used or through big resistance earthed power system,this system after the single phase grounding,because there is no loop or that do not produce a large current in the pumps circuit without earth current or large

grounding current,so does not affect the normal operation of the system.Although does not affect the

normal operation of the system,single phase grounding is a failure,in order to guard against ground

for the extension of two phase ground or make the grounding device further damage,such ac alternators 220v as rules of single- phase earth fault happened,to find out the reason,in 2 hours to make processing,2 hours to check out reason or can't handle,would power outage after processing.